AGPtek Bluetooth 4.0 Car Kit In-car Hands Free Speakerphone/ MP3 Player/ Music Receiver with Clip Long Work Tme :Hands-free Working Time: About 17 hours; Stand-by Time: About 1000 hours/41days ) Easky to Use: Just clip and go-on installation, no programs, no wire. With the microphone mute function. With HD Voice With the HD Microphone Strengthening noise cancellation technology. Hear your calls clearly with its dual microphone technology Simultaneous Dual Phones Matching: Phone 1 has authorized priority to Speakerphone than phone 2 Compatible: Bluetooth-enabled mobile phones, laptop, tablet, or MP3 player, etc.